Safety mechanism for clutch operators



Sept. 16, 1930. AjHor-'MANN 1,775,000

SAFETY MECHANISM FOR CLUTCH OPERATORS Filed Dec. 22, 192e N ATTORNEYS- Patented Sept. 16, 1930 y j UNITED STATES PATENT OFFICE ALBERT HOFMANN, OF ZURICH-ENGE, SWITZERLAND SAIfETYpMECHANISM FOR CLUTCH OPERATORS i Application led December 22, 192.6, `Serial No. 156,282, and in Switzerland December 30, 1925.

Thisinvention relates to a combined ma- From the shafts 17 working elements 19 chine for mixing, stirring and beating'macan be driven by shifting of clutches 18, said terial in large quantities or in small quanelements 19 being designed for connecting tities for `use in kitchen and confectionery, auxiliary machine elements, belt pulleys, and

said machine having connection-points for the like. rlhe clutches 18 can be engaged and 55 connecting auxiliary machines. lThe invendisengaged with the aid of hand levers or the tion consists essentially in that automatic like, arranged on the outer side of the ma- Vclutches and safety devices are arranged for chine housing, and not shown on the drawldriving the auxiliary machines vconnected ing.

"`10 with the` main machines, s'o that said auxil- The abovedescribed mechanism is arranged e0 iary machines lcan be connected with the corone on each side of the driving motor 1. Y responding gearing only when the clutch 1s In the form of construction shown, one of disengaged. the two counter shafts 5 drives two bevel An embodiment of the invention" is shown, wheels of two other driving elements 19 315 by way of example, inthe accompanying (Fig. 2), which are adapted to be engaged or 65 drawings, in which: ,Y l disengaged, in the manner described, each by Fig. 1 shows the machine in side elevation, a lockable clutch 18, with the aid of an adpartly in longitudinal section. f Justable hand lever arranged on the outer F1g.2is across section, partly in elevation. side of the machine housing 2, so that, in

" "-20 Fig. 3 is a section in elevation through the the form of construction shown, all four auxl70 casing at one end showing a clearer view of iliary driving elements 19, 19 can be rotated. the safety device. Y The clutches 18, 18 have safetyor lock- `In the housing 2 of the machine the driving-arrangements, designed to prevent the ing motor, for' instance an electric motor 1, 1s connecting of the auxiliary apparatus, unless accommodated, which has one pinion 3 for the clutches are disengaged (Fig. 3). The 75 every counter wheel 4 of each counter shaft auxiliary apparatus, which are not shown, `5, Y' said counter shafts driving changecomprise each an insertion piece 36, through wheels 6 fitted each with one clutch element which the driven shaft 43 of the auxiliary 7 The change wheels Gare shiftably mountapparatus projects, said shaft carrying a taped on sleeves 8, said sleeves being mounted on pet 41,'adapted to be brought into engage- 80 shafts 17. The shafts 17 are capable of roment with the slots of the driving elements tation in the sleeves 8 and they are driven 19, 19 respectively. This insertion piece 36 from the counter shafts 5 by pairs of spur has a conical radially extending recess 42, wheels 16, 16', the spur wheel 16 being and the shaft 39 of the coupling lever 40 has mounted on shaft 17I and carrying the second a similar recess 38, a locking pin 37 with con- 85 lhalf of the clutch, with which the change ical ends being shiftably inserted between the wheel 6 which carries thefirst half clutch eleinsertion piece 36 and shaft 39. The pin 37 ment can be brought into engagement. The is of such length that when one end thereof change wheels 6 are adapted to be shifted on is in the recess 38 of the shaft, the opposite v 4 the sleeves 8 carried by the Vshafts 17, by end is clear of the recess in the member 36, 90 means of hand levers, which are not shown, and vice versa, the conical formation of the in su'ch a manner that lthree different speeds said recesses acting on the similarly formed can be produced. The rotation of the change ends of the pin when the shaft 39 is rotated, wheels 6 is transmitted through the intermeto cause reciprocatory movement of the pin,

diary of bevel wheels 9.and 10 upon a vertithe recess 38 being so located that only 95 cal shaft 11 and acorresponding planet gear when the clutch lis disengaged can the pin vthe circulatingrwheels 12 of which are keyed enter'said recess. The clutch 18 is moved upon vertical shafts 13, which carry on their into and out of operation by rotation of the v free end 14: the exchangeable miXing-stirshaft 39, said shaft having at its inner end 50 ring and beating tools 15. what is known as a quick thread 39 adapt- 100 ed to engage a lcollar 44 similarly lthreaded at its interior, and which collar carries the usual bifureated yokeV 45 straddling the eluteblA i forsbiting said Gluten, Y

y i When the Clutch isjdisengaged, in which' case thelever. 40 is' inthe position shown in Fig. 3 tb'ejloelging pin 37 Willbe pushed into the refeess- 8'V ofgf lsihaft 39 aetionofAri tflle ,insertiony piece v36 Wlien'the, auxiliary ma- Chine, belt pulley or tbexlile, is being'put'on,

and the insertion piece! can -beseput on eem-A s fpushing/,at this f'oceasion, the ,loeking-,pin' 37 the .auXliar irse pieceiand prventsthlirwtihg 011 f of said insertion piece.'y f

t ret, .ifniyiepe hair eff-fum A 1111101111111k ist@ 111111` reed., merely 't11e1w121k111s @points are, fredueed but not the.i above menftined; advantages! ,This frmf @ensure within the 1101,1111ds'V machine accor of.' -iery @compact ,construction andr possesses,

as amanyfsfled P QSSiblty @implication @11d lpermits of carrying y out the. In-ost' yd iiierent KYl1ouse-l1old`kitehenandV eonfec'tionerywork aifpraetical, rapid and eomfortableiorm. f Vrlllienrnaoliine desribed-UlW-servdffforinthe Y drawing .proyidediwith suitable fmeehaf `nisIn 4for rasngfanl l0Waringy A.the Same,

- eentialfrart ofthePfesnt inventen, it iS deemedaunnecessary,to d,eseribein detail:y g

no111bi1111#1011,-V a dririllglshaft; dringflefuient-mounted forfrotaton in ahnement "Seid driving shaftfcooremtng 'Clutch 255' rrnlbersL .Carried by Sai-,dY drivingehaft and :nermallydisengaged, bear-'111g '11'1e111l11e1v 1.11-k 11iorab 1yV Supported 1.11 y 111111611191111 Mithisaid driving element 211111- Gerrying I 1111 waiter-y 1i-rf f shaft ,Salddr y n LShattlatineG11 r11/ratingmeansforfiwnneetfine the111'vfoiretete11r'together, means for `rbringing,@regantenbanniere1mit operatief@- g means-,9e 'edf engagement, animalier --Ishaft,fsaideluteli members being normally .i t "rotatable ,Y (gluten-shifting 5 zsliaftdis'p'sedin 'parallel relation said 01 i, f drivingfheftfgering 'betweenad Clutch:

shifting-@Mft and Sad'lshiftablel Clutch orerative'engesment'- Y dma v111.11111,111111211@'011 1S i :besides goed accessiblitytanrli a secure bogus-1 V 1 v fing .ereh1-dinganyV danger for the attendent,

,n earriedlbyr said.` driving elementi, a; V"eooperat9.100;

I zinglutch; members slidablef 011] Seid driving disengaged, a; I11e-tatable@lut 1,1-Shifting` V'fp disposed in parallelf relationfwitli Said means automatically operatiye Vwhen tbe l clutch members are in engagement t`op're` ,vent removal of the bearing memberand f also` operative to prevent',insertion.V of the Y bearing member While the clutch members combingatie;i,yl adrivilngfshatgfadriving ele- Y Y I ment `mounted `for rotation infalinementjl, with said driving shaft, a'elutch member car- Yin; 1i

"clutch member slidable on 'said Y drivingj` disengaged,

OffeneegementWthits-cooprating Clutch* ment and carrying. an auxiliary fshaft, A[said V Y driving .element andlafuxiliary shaft,havingVVV fiorr11ei'1111t11e,removalY and inserti@ oftheV bearing member When the elutehfshifting;

Shaft-h Vment mounted for rotationazn; aflinement'Yy withv said driving y shaft, a elutel 1. .member shaft, saidv clutch members1,being,r r,n frrn ally disengaged, ax rotatable Glutenshifting shaft e :disposedinparalletrelatie with said,driv!Y inashaftgearinglbetweer1?Seidflutchshft- 1@1105 Aingshatgaindj saidaslriftable'elutelnmember yfor, shifting thesameintoand iout offengage 1111e11t1wit1gits Goereratnelutchs'memberi bear-111g member 1re-111@1 '.1111115'l Supported Vin palinement withfsaid-driving element-.autismo carrying-1111 auxiliary Shaft; midi driving Xelement land Y auxiliaryfsbaft f-lialvingy cooperl atingmeansfor .reonneetingthem rfor rotation; together,' and eamming means Ybetweenv Y gtliegbqaringf member and; .elut'ehsbiiting'31:15` shaft forv preventing simultaneous rotation ff QffSa/dimembers therebtftO-'pltevent 1261111111111,"

Af .1..11d iesertion the bearinearnernsber .when f ,the ,clutch-shifting'shaft hasbeen trotatedto ing shaft, gearing between said clutch-shifting shaft and said shiftable clutch member Jfor shifting the same into and out of engagement with its cooperating clutch member, a bearing member removably supported in alinement with said driving element and carrying an auxiliary shaft, said driving element and auxiliary shaft having cooperating means for connecting them for rotation together, said clutch-shifting shaft and bearing member being each provided with a radially-extending opening, and a slidable pin disposed between said shaft and bearing member and adapted to engage said openings with its opposite ends respectively, the Walls of said openings being so formed as to exert a cam action on said pin whereby upon rotation of either of said bearing member or olutoh-shifting shaft the end of the pin is moved out of the opening in such rotating member and its opposite end caused to enter the opening in the other member.

In testimony whereof I aix my signature.

ALBERT HOFMANN. 

